Bugfix for transport resolution, if the package is not found on the current provider #14260
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What does it do?
Check $resolution for emptiness instead of false.
Why is it needed?
$resolution can't be false since it is initialised as array in https://github.com/modxcms/revolution/blob/2.x/core/model/modx/transport/modtransportprovider.class.php#L164
If a dependent package is not found in the provider of the package with the dependency, it is never found because of this bug.
Related issue(s)/PR(s)
#12666